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Showing 1 to 20 of 96 for “"ascorbate"”.
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A Possible Role of Ascorbate in Boron Deficient Radish (Raphanus sativa L. cv. Cherry Belle)
… of growth. Deficiency causes a reduction in ascorbate concentration and the absorption of nutrient ions. Addition of ascorbate temporarily relieves deficiency symptoms. In boron sufficient plants the addition of ascorbate to media causes an increased uptake of nutrients. In an attempt to …
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Identification and Characterization of Genes Involved in Regulation of Ascorbate Metabolic Pathway(s) in Arabidopsis thaliana
… gene functions as a negative regulator of leaf ascorbate content. Overexpression of AtPAP15 with the CaMV 35S promoter resulted in up to 3-fold higher AsA levels than wt plants, where two independent SALK T-DNA insertion mutants in AtPAP15 had 50% less AsA than wt plants. Enzyme activity of …
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Isotopic fractionation of chromium and uranium during Cr(VI) reduction by ascorbate and U(VI) reduction by sulfide
… with reduction of Cr(VI) to Cr(III) by ascorbate and reduction of U(VI) to U(IV) by sulfide. The results of this study yielded isotopic fractionation factor values (ε) for reduction of Cr(VI) by ascorbate of -2.83‰ ±0.05‰ and -3.16‰ ±0.23‰ in two duplicate experiments. These results are …
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Speeding up solar disinfection : effects of hydrogen peroxide, temperature, and copper plus ascorbate on the photoinactivation of E. coli in Charles River water
… copper metal in the presence of 200 [micro]M ascorbate synergistically increased the light-mediated inactivation rate with first-order dependence in both dissolved species, while the addition of hydrogen peroxide to this system exhibited further synergistic enhancement. Although solid copper …
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Amperometric responses of some biosensor-related analytes at electrodes coated with semipermeable polymer layers: a comparative study /
Amperometric responses of hydrogen peroxide, ascorbate and paracetamol have been studied at platinum electrodes coated with Nafion or electropolymerized polypyrrole and poly(o-phenylenediamine) and polyaniline (PANI) layers. Among the three layers studied, the Nafion layer shows superior …
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Characterization of multicopper oxidase-related protein and multicopper oxidase-1 in insects
… well-studied MCOs are laccases, ferroxidases, or ascorbate oxidases. Previously we found Drosophila melanogaster MCO1 has ferroxidase activity and we identified three putative iron binding residues in DmMCO1. Our kinetic analysis of recombinant MCO1 from Drosophila melanogaster, Anopheles gambiae, …
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Effect of light stress on the homoiochlorophyllous resurrection plant Craterostigma wilmsii
… carotenoid (x + c) content, anthocyanin content, ascorbate peroxidase activity, and ultrastructure, were assessed. Shaded inner whorl leaves do not experience lightchlorophyll interactions, carotenoids and anthocyanin pigments do not accumulate and ascorbate peroxidase activity remains low in them …
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Inhibitory Effects of Ketoconazole on the Oxidation of Linoleic Acid Micelles, Phospholipid Liposomes, and Human Low Density Lipoprotein (h-LDL)
… (SLO) (500-5000 units/ml), Fe(III)Cl3/ascorbate (5-100microM) and hematin (5-100microM) induced oxidative modification of lipids present in micelles of linoleic acid (0.5 mM), liposomes prepared from phospholipid extracts of bovine brain (2.5 mg/ml), and h-LDL (0.5 mg/ml). Oxidation of …
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Photoprotective role of beta -carotene and antioxidant enzymes: A shield against ultraviolet damage in Dunaliella bardawil
… nm), independently, for 24 hour test periods. Ascorbate and glutathione concentrations, ascorbate peroxidase activity, photosynthetic oxygen evolution and fluorescence parameters were monitored following exposure to UV and various light treatments to assess changes in photosynthetic processes. …
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Profiling phytochemical and nutritional components of potato
… in the skin than in the flesh of tubers, except ascorbate, which was undetected in the skin. Differences were on average 2.5 to 3-fold for carotenoids, 6-fold for phenolics, 15 to 16-fold for flavonoids, 21-fold for glycoalkaloids and 9 to 10-fold for antioxidant activity. Higher contents of …
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Biochemical and histological investigations of viral localisation in the hypersensitive reaction of Phaselous vulgaris L. var Pinto to tobacco mosaic virus infection
… these cells. Inhibition of phenolic oxidation by ascorbate infiltration or elevated temperature treatment resulted in the absence of extra-fluorescent metabolites and the continued movement of virus in the absence of necrosis. Further studies with i ascorbate infiltration indicated that …
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Biosynthesis and degradation of proteoglycans in cultured smooth muscle cells
… sulphated than those produced in the absence of ascorbate. The glycosaminoglycan chains associated with the proteoglycans synthesized by rat smooth muscle cells were heparan sulphate, chondroitin sulphate and dermatan sulphate. There was no evidence for the synthesis of hyaluronic acid by these …
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Factors affecting copper utilization
… doses of L-cysteine (4000 mg/kg diet) or L-ascorbate (1000 mg/kg diet).
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Defining D-Arabinose Metabolism in <i>Leishmania major</i> and <i>Crithidia fasciculata</i>
… used by all the kinetoplastids to make D-erythroascorbate, a C5 ascorbate analogue similar in structure and physicochemical properties to ascorbate (Vitamin C). In animals and plants, L-ascorbate is involved in cellular defence against oxidative stress. The D-erythroascorbate analogue of …
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The effect of Ascorbic acid ingestion on the risk of calcium oxalate kidney stone formation
… Other aliquots were withdrawn for immediate ascorbate analyses. Urine samples were analysed for sodium, potassium, magnesium, calcium, citrate, oxalate, urate, phosphate and creatinine. A new flow-injection method was designed, developed and tested for the analysis of urinary ascorbate. …
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Free Radical Activity, Lipid Peroxidation and Antioxidant Status in Diabetes Mellitus
… period in these patients. Plasma urate and ascorbate levels decreased rapidly, whilst interestingly, α-tocopherol levels /lipid ratios were preserved. The study indicated the resilient nature of the antioxidant defences in plasma, although further studies are required in order to elucidate …
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Comparative study of an antioxidant defense mechanism in genotypes of eastern white pine which show differential foliar characteristics
… during the two growing season. Seasonal needle ascorbate concentrations were similar during the two years however, needle glutathione (GSH) content has not. Total GSH content was two-to three-fold greater in both genotypes during the summer of 1989 compared to 1988. Cloned, tolerant trees also …
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Pre-weaning diet and stall weaning method influences on stress response in foals
… behavioral protocol and the responses of plasma ascorbate, serun1 cortisol, and the serum cortisol response to an ACTH challenge. Behavior scores (1 to 10) as an index of stress were assigned to each foal daily, with high scores indicating less stress and better adjustment. The experimental plan …
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